Website doesn’t appear on google

Hello, May I ask your opinion?
There is something weird that's going on with a website of mine.
On May I registered a new domain never registered before.
I added 3500 unique and quality content on homepage and made every possible optimization.
On August I started building steady backlinks. As for today I drop 12 PBN backlinks out of 30 scheduled.
The weird fact it's my website is indexed but doesn't rank for my KW. I must say It's not the most easy KW of the world, yet I think with 12 PBN…

Website doesn't appear on google